Use GNOME Looking Glass for debugging

Looking Glass is GNOME Shell's integrated inspector tool and JavaScript console useful for debugging.

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Open the run prompt by pressing Alt+F2

Enter lg to start Looking Glass

Commands can be entered directly at the prompt e.g. global.get_window_actors()

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Exit at any time by pressing Esc

This step-by-step guide walks you through packaging your own Python applications from simple examples to complete installers and signed executables.